Muffler for internal combustion engines



Jan. 5, 1932. N s, BAITS 1,839,192

MUFFLER FOR INTERNAL COMBUSTION ENGINES Filed Dec. 20, 1929 lrxlvawi-rjaz b MQJM 17w Patented Jan. '5, 1932 UNITED STATES ATENT OFFICE STUART G. BAITS, Oil! GBOSS E POINTE PARK, HIOHIGAN, ASSIGNOB- TO HUDSON MOTOR CAB COMPANY, 01' DETROIT, MICHIGAN, A GOBFORATION O1 MICHIGAN MUFFLER FOR OOHBUQIION ENGINES Application fled December in, 1929. Serial Io. 415,488.

My invention relates to mufllers for internal combustion engines and has for its objectto provide a new and improved mufiler which will not only muflie the exhaust of the engine more efliciently but which will also be less expensive to manufacture and more durable. As is well known by those skilled in the art mufliers for internal combustion engines will not always perform as well on one type of v engine as on another. For instance a muffler which is entirely satisfactory for a six cylinder engine ma be much less so when used on a four cylin er engine and vice versa. The mufller embodying the present invention has been found to be particularly satisfactory with six cylinder englnes and also gives satisfactory results with straight eight engines.

The mufller embodying my lnvention can be made very cheaply and rapidly but is strong and can withstand the strains to which it is likely to be subjected due to mufller explosions which occur when unburned gas accumulates in the mufiler. The muflier embodying my invention is also capable of bein made in different sizes for different sizes an types of engines by changing a single part of the construction.

The invention will be fully understood from the following description when taken in connection with the accompanyin drawings,

and the novel features thereof wi be pointed out and clearly described in the claim at the close-of this specification.

Fig. 1 is a longitudinal section of a'mufller embodying my invention in its simplest form.

Fig. 2 is a sectional view of a similar muf:

A fler intended for use on a larger engine.

. Fig. 3 is an end view, and

Fig.4 is a section taken on line. 44 of Fig. 2.

Referring particularly to Fig. 1 of the drawings: I The mufller includes an inlet pipe '11, two body per orated baflles 14, 15, 16 and 17 exhave in addition to their hemispherical porthen pass through .set of bafliesand finally escape through the end pieces -12 and 13, and-four or more haust pipe 18 may also be connected at the rear end.

The two end body members 12 and 13 and the four baflies 14, 15,16 and 17 are all flanged and arranged with the flanges in contact with each other. The parts are then preferably welded to ther as for instance b butt or spot weld i ig. .Each of the baflles is of spheroidal shape but the baflles 14 and 17 tions cylindrical portions which ioin the laterally'extending flanges. The cy indrical portions of these two baflies are pierced by perforations 20 while the spheroidal portions of the baflles 15 and 16 are alsopierced by holes 21.

The end body members 12 and 13 are also provided with a plurality of inwardly extending depressions 23 of relatively large extent and depth. These de' ressions form constrictions in the passa e etwe'en the bames. 14 and the interior oft e end bodyanembers and have-an influence on the flow of exhaust gases through the mufiler. They also increase the resiliency of the shell of the mufller, thus improving its resistance to the strains of mufller explosions, and b modi 'ng the form of; the otherwise bell-sha or generally hemispherical ends, avoi any tendency toward resonance in the latter. I8 The exhaust gases from the en 'ne enter theend body member 12 through t e pipe 11, the constricted passage between the insi e of the end bod member and the hemispherical baflle 14, t en enter the baflle through the holes 20, then pass the ace 24 of the mufller." There ing the central ough the holes in the second after they pass exhaust pipe 18. I find in actual practice that the arrangement described produces a very effectual muflling of the exhaust.

In Fig. 2 I" have shown my improved mufller constructed for use in connection with a larger engine. In this case the m'ufiler is exactly the same except that the flanges of the end member 30 and bafiles 31 and 32 are welded to a flange 33 on a cylindrical body member 3a to the other end of which are welded the baffles 35 and 36 and the body-end member 37. The body member 34 may be made of any desired length, and it will thus be seen that the capacity of the muflier may be easily increased by providing it with a body member of the required length.

I claim:

A mufiler for internal combustion engines having an exterior shell, exhaust and inlet pipes connected at the ends thereof, said ends being of general hemispherical form broken by a plurality of inwardly extending depressions, and two oppositely facing groups of battles within said shell, one of said groups being positioned adjacent the inlet pipe and the other group being positioned adjacent the exhaust pipe, eachof said groups comprising an inner and outer baffle having contacting flanges extending to the exterior shell, said inner bafile having a perforated outwardly extending portion of general spherical curvature, said outer baflle having a perforated outwardly extending substantially cylindrical portion connecting an end portion of general hemispherical form.

In testimony whereof I ailix my signature.

STUART G. "BAITS. 

